Flexure Behavior of High Strength Concrete (HSC) Beams Reinforced With Carbon Fiber Reinforced Polymer (CFRP) Rebars With and Without Chopped Carbon Fiber (CCF)

The flexure strength and behavior of high strength concrete beams reinforced with carbon fiber reinforcement (CFRP) rebars with and without chopped carbon fiber (CCF) were investigated by conducting flexural testes on a total of 27 simply supported HSC beams under two symmetrical point loads. The main parameters considered in the study were the reinforcement ratio ?, compressive strength of the concrete f`c and volume fraction of chopped carbon fiber Vf. It can be seen from the experimental results that the maximum carrying capacity increases as the reinforcement ratio, concrete compressive strength and the volume fraction of copped carbon increases. Crack spacing of the fiber reinforced concrete (FRC) beams was about 20% smaller than plain concrete beams at service load (30% of ultimate load). Addition of fibers significantly improves the system’s ductility; nonetheless the ductility index depends on amount of reinforcement (higher reinforcement allows for lower deformation, thus a lower ductility index) obtained.